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Old 16 Jan 2008, 05:16 pm
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Default Problem with a 2000 Honda Accord and intermitent misfires?

The car has run fine since it was purchased new... now it has a problem where maybe one a week it will do the following. It will start perfectly when you first drive it... you will stop at a store, and then when you return to the car it will misfire to the point that it will no longer idle... you can only keep it idling by holding your foot on the gas.. the ODBII codes are for misfire on 3 out of hte 6 cylinders and a for multiple misfires... I took it to the dealer, and he said nothing was wrong... he then said he test drove it and got a reading on the EGR valve.. He replaced it and now it continues to do the same thing... clearly I have no faith in the dealer and am wondering if anyone else has had similar issues. It only does it after you've driven the car but not every time just randomly... more often than not it functions perfectly.Nothing has been modified on the car it has been left completely stock. I did wonder about the sensors or something related to the variable valve timing, but I assumed if the sensor or something major was failing that the problem would occur much more frequently (was actually hoping it would happen all the time so the mechanics could experience it first hand instead of having them just randomly change parts and make money while the problem persists).Actually the vapor lock does seem to make sense... I think it has happened on warmer days...
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Old 16 Jan 2008, 05:31 pm
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try cam sensors
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Old 16 Jan 2008, 05:46 pm
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i would say cam sensor or exhaust you change the exhaust or take any parts out of the stock?
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Old 16 Jan 2008, 06:01 pm
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What you are describing is a classic description of vapor lock in the fuel lines. Winter blend fuel has a higher alcohol content to help the fuel evaporate in cold weather. the problem is that when you have a winter blend gas with a higher alcohol content and drive the car then shut it off the alcohol in the fuel lines vaporizes from the heat of the engine. The 15 minutes seems to be a critical time. Up until about 5-10 minutes (depending on outside temperature) the fuel lines don't absorb enough heat from the engine to vaporize the fuel. After about 20 minutes the engine and the fuel lines cool back down and the fuel vapors condense to liquid again.the condition also happens more frequently when you have a warm day than when you have a cold day.Running the engine after it starts and is sputtering clears the vaporized fuel out of the fuel rail and brings fresh fuel up from the fuel tank. As soon as that happens, the condition clears up.The recommendation is to change the brand of gas that you're running in the car. Every brand and in fact every truckload has different quantities of alcohol and alcohol derivatives. The best brands don't necessaryily mean the least amount of alcohols. So try another brand and see if the condition goes away. Also, be sure you're running the recommened octane fuel in the car. Higher octane fuels are more volitile and more likely to cause this condition, so if your owner's manual calls for 87 octane and your running 89 or 91, drop back to 87 and see if that eliminates the condition.this condition should fix itself in about 10 weeks when the manufacturers start mixing the fuel to the summer blendhope that helps
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Old 16 Jan 2008, 06:16 pm
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Sounds like an engine coolant temp sensor problem.This sensor is the modern day choke system.So when the engine is cold it will start straight away and warm up ok as long as you don't turn it off after a quick drive to the store and then when you come to restart it's neither here nor there and gets confused and floods the engine.
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